I do not accept that initial low pricing with cause initial customers to become upset when prices are raised. They might not accept your raised prices but that means they will get what you sell from someone else or go without. Or come back to you when they find no-one who is cheaper, or no-one with as good service as you provide.
People aren't all or nothing. The point of low initial pricing is to get a start in the marketplace. Low prices will get the keen shoppers. They won't bring other companys' loyal customers, but neither will high prices. You have to start somewhere. Sure, you can start with high prices, but that is a more difficult start than starting with low prices.
When you start a business, the first thing you need is a few sales. You need those initial sales to; a) give you confidence that you have a product or service that people want, b) test and allow adjustment of your procedures; c) let the market know you exist. The faster you can accomplish those few things, the better it is for you. Even if initial sales result in a loss.
Once you have a few sales under your belt and your busiess is actually operating, then is the time to adjust your prices to whatever level you choose. But to start you have to get started!