One-Time Investment vs. Monthly Subscription: A Realistic 3-Year Cost Breakdown for Your Online Store

When deciding how to build an online store, the first decision often looks like this: "Shopify is 29-79€ a month, that's cheap, let's go with that." And at first glance, it is cheap. The problem is that the number on the pricing page rarely reflects the real cost you'll end up paying after three years of running the store.

Let's calculate it honestly, number by number.

What you're actually paying for with a SaaS platform

The monthly subscription is just the entry ticket. After that comes a series of costs that rarely get mentioned in the marketing material:

• Transaction fees — if you don't use the platform's own payment gateway, you pay an extra 0.5-2% on every transaction, on top of the bank fees you already pay
• Marketplace apps — for features a custom platform has built in (advanced filters, B2B pricing, loyalty programs, advanced reporting), you pay additional monthly subscriptions, often 20-100€ per app
• Theme and design — premium themes cost a one-time 200-350€, but any serious design change beyond the theme's limits requires a developer working inside someone else's restricted system
• Sales growth — many platforms have pricing tiers; once you cross a certain number of orders or revenue, you're pushed into a more expensive plan

Sample calculation: SaaS approach (3 years)

Let's take a realistic scenario for a mid-sized store with a few thousand orders per year.

A mid-tier monthly subscription runs around 79€, which is 948€ a year, or 2,844€ over three years. On top of that come transaction fees, which for this volume can run around 60€ a month — 720€ a year, or 2,160€ over three years. Then there are marketplace apps, typically three to four of them, costing around 90€ a month combined, which is 1,080€ a year, or 3,240€ over three years. Add to that a one-time premium theme purchase of around 300€, plus occasional tweaks and fixes usually handled by a freelancer, estimated at around 1,500€ over three years.

Add it all up, and the total cost over three years reaches roughly 10,000€.

And this is a conservative estimate — it doesn't account for a plan upgrade due to growing sales volume, which is nearly unavoidable for most serious stores by year three.

Sample calculation: custom solution (3 years)

With a custom solution, you pay for development once, upfront — and that's it. We don't charge for hosting or maintenance, so there are no additional monthly or yearly bills after launch.

Building a custom store, including the admin panel, typically costs between 1,500€ and 6,000€, one time.

Add it all up, and the total cost over three years stays exactly the same as the initial investment — roughly 1,500€ to 6,000€, with no additional charges along the way.

The gap grows even wider once you factor in that a custom solution charges no transaction fees, and that every new feature (a B2B portal, ERP integration, an AI sales chatbot) doesn't come as another monthly line item — it's built once, as part of your system.

Where the break-even point actually is

For smaller stores with a few dozen orders a month, a SaaS platform still makes sense — there's no need for an upfront investment if the volume doesn't justify it. But as soon as a store enters a phase of real growth, usually somewhere between year one and year two, the SaaS platform's monthly costs overtake the price of a one-time build, and then just keep climbing — while for a custom solution, the cost curve flattens out almost completely after the initial investment.

There's also a part that's hard to put a number on: ownership. With a custom solution, the code is yours, the data is yours, and no one can change the pricing overnight or force you to migrate because the platform discontinued a feature you relied on.

Conclusion

A monthly subscription feels cheaper because the cost is broken into small, unnoticeable installments. Once you add it all up over three years, a custom solution often comes out cheaper — and on top of that, it gives you full control over your store, with no dependency on someone else's platform.

If you're thinking about migrating, or just starting your store and want a realistic cost estimate for your specific case, we'd be happy to work it out together.