I don't think it's fair to give this app a bad review based solely on its change of price. Developing an app is not cheap, if you want better support, frequent updates, that's the price you have to pay. Plus, the app is only under $10, it always amazes me how some people will spend thousands on a mac without thinking but will agaonize over spending $5 for an app.
So on with the review...
There's no shortage of uninstaller apps for mac, even with the ability to delete apps in launchpad, other files are leftover. I've used trashme since SL and it is in my opinion the best uninstaller for my needs. I've tried appzapper and appcleaner before using trashme on SL, the biggest problem i had with those apps was that they didn't find as many relevant files to delete as trashme. Not to mention appzapper is $13, unstable and crashes all the time, and hasn't received an update in over a year and a half. I did my research and wasn't interested in apps that ran in the background to monitor my trash because those tend to not play nice with apps that updated over sparkle, so I settled on trashme because it was free and it worked extremely well and received frequent updates.
Once I upgraded to Lion and found out trashme was updated to support it, I was happy but kind of bummed it is not free anymore. So I went back to the free appcleaner, but after using it, it kept finding extra and irrevelant files (i could just uncheck to not delete it but it was still annoying). Then I read the trashme developer's comment underneath and that convinced me to buy trashme (i paid the introductory price), and i'm glad i did.
The new UI is beautiful and fits with lion seamlessly, but more impressive is its function... it really finds all the right files to delete! It's nice that it also protects your favorite apps, can delete widgets and also has a smart delete function that monitors your trash for deleted apps and also removes the leftover files. I also like how the app is updated regularly, and you pay once to receive lifetime updates. One thing I'd like to point out is that it would be nice if the developer included the previous version for download for people still on SL or leopard. I really hope this app has a long lifespan and the developers continue to make this app even better, so lets support them by purchasing this app.
If you think the price is too much then there's plenty of other alternatives, but I think trashme is the best and $7 is not too much to ask for such a polished app.