so I've been doing a lot of reading and trying to decide what to buy to get into mining, and I've been using this website: http://thegenesisblock.com/mining/ to help figure out costs and return... my question is are the statistics on that site calculated based entirely on the assumption of solo mining?

for example if I bought a mining rig off ebay that can do 100 or so GH/s, and get it all setup and running in feb, when I look up the gear in http://genesisblock.com/mining/ it basically says there is no way I'll recover my costs if I start in feb 2014.... but is that only if I'm solo mining?

right now the only pool I want to join is this pool if I get this mining operation going from my basement.

Thanks,
Kurt