While the price may be correct for this product unfortunately it is just one of many apps, some free, and some commercial that search for a file on your hard drive and do little to nothing more. Convenience and ease of use is one of those things, like speaker selection, where a high degree of personal judgement comes into play.
Personally I like Apple's Spotlight for simple searches for files and as a fast App launcher (using 10.8). A little time spent with it, learning how it wotks with key combinations (Cmd, Opt, Cntr, Shift) yield some amazing results. Spotlight can also lock onto comments placed in a files 'Get Info' window which can contain only key words.
For more comprehensive file management I have never found anything to compare with File Buddy. It finds everything, including invisible files and files buried in the core of the system. It also has an immense number of other features such as locating invisible and duplicate files. For me it duplicates or replaces an absolutely huge number of other file management utilities. Yes, it is expensive for a utility, but for me it is an extremely good value with a long pedigree.
In some respects I would like to apologize to the developer of Power Select, not for seemly casting aspersions on his product, which is not the case, but for using his latest release as a soapbox to make comments about all the wide variety of products that essentially do the same thing, abet in slightly different ways, but do little else. I can only hope that the developers who are talented and creative will focus their future efforts on adding expanded features to their 'find' products or concentrate their efforts into other Mac Apps where the interest and demand for better products is of user interest.
While this product may be very good and worthy of a donation, I personally believe that their are far too many 'Find a File' apps available right now and that it is time that some of them become mature products.