I used to run SETI, clocked up a very respectable score too but found it created issues with my PCs. I did not enjoy having to reboot once/twice a day to clear whatever the problem was and having to manually intervene periodically because units werent being sent/credited. It played havoc with my overnight downloads.
I need a true install and forget program, no stability issues, that updates automatically when required. It should cache data in case of net interruption and should have a nice score chart so i can refer to my units periodically in comparison to others. I will not perform work for commercial companies unless I get some of the money they make, other than that it just has to catch my imagination somehow.
None of these things are much to ask for, I imagine its similar for most other people.