Few times I searched for a domain, the next day I search for it find it already reserved by them and on sale for hundreds of dollars instead of the regular $10 it was the day before.

I can confirm this experience, on 2 occasions when I looked up a very specific (and definitely not common) domain, they were suddenly reserved by GoDaddy and sold for a premium price. Not hundreds, but like 50-150 instead of 12.

I can't prove it, of course, but after hearing about those problems with GoDaddy multiple times it just seems too convenient for them to be a coincidence.