That's.... ok, but you have to realise, you might not like the alternative. It's one thing when a huge company like Adobe does it (although, I can certainly understand their need to appease investors) - but for a lot of these companies, subscription model is the only way to make a sustainable business. These people don't drive Ferraris and do it out of greed. Blame it on the fact that the whole App Store economy is borked for serious apps. People are not willing to pay more than a couple of dollars (if anything), and $10 apps are considered "premium". At the same time, we expect fully featured, powerful apps.
I don't like paying more than I have to. But without subscription pricing, a lot of these apps would be unprofitable. You dislike the business model? Well, you should be willing to pay much more for quality apps. Most people aren't - but are willing to pay a dollar or two monthly. CSP, a serious, professional app, costs around $2 a month. That's not a lot for such an app. It is more expensive than the Mac/PC version, true, but the install base is a lot bigger on desktops/laptops than on iPad. So they could either charge it, I'm guessing $150-$200 price to make it sustainable for the install base and achieve Mac/PC profits, or do a subscription model which is much more popular and acceptible. Or, you know, just don't do the iPad version at all. As it is, I'm glad we have CSP on the iPad. It's a fair price, I think.