You should make the same long-term as solo mining. However your variance will be a lot lower because you are sharing the workload with the rest of the p2pool network. Running your own node is kinda like solo mining and kinda like mining at a normal pool.

It's actually quite cool and worth it to set up. Try it out.

Note the p2pool-vtc distribution was updated today for a fork tomorrow as we correct some settings and improve things. The new fork is already live for people installing new nodes, but the bulk of the speed won't be there until tomorrow when a number of the bigger pools will move at the same time.