I'm looking at idea of getting a eCommerce app developed for both Shopify and BigCommerce but unfortunately I can see people will only pay ~$5-10 per month for the app. Theres potential someone on BigCommerce might pay slightly more.
With this in mind I just can't see the commercial viability in this or am I missing something? 100 users x $5 = £500 MRR.
You will probably need to adopt a value ladder approach that includes tiered pricing that allows your users to pay you more for more value provided to them. Customers at the start get access to the core functionality of your app, and as they mature they get access to functionality that is secondary to your core business by paying for it.
If you don’t have a product that fits well into multiple tiers than you can create cross sells to other products in the space that you’ve built and will solve other problems your customers have. Thus increasing your MRR.