They don't expect you to stick with circuit studio it is merely a sales tool for which the customer pays.
That's exactly what it is. The marketing term is funnel, and the goal of the product lineup is to get you to the most lucrative (for them) possible point. They don't worry about what's useful to you (they're not engineers so are clueless), or what's a good value, or even practical - they look at what sells and drives the funnel. So you get bizarre products where you can't add library parts or other preposterous stupidity. The other big problem with the marketing funnel is it's constantly changing, so sure you can buy upgrades for $150 perhaps, today, but what about 5 years from now? The product is terminated and replaced with another piece of funnel collateral, and you're given 50% off the first year of AD and told to go buy that if you want it to work properly with Window 15.
It's MUCH better to buy the top end product from an entry level player than an entry level product from a player way up the value ladder. With something like Diptrace you're guaranteed that unless the company is acquired they will be focusing their energies on their main product, not some crippled-down bastard version that won't stand the remotest possibility of cannibalizing their cash cow. You want the product that puts their reputation on the line, not some marketing toy.