Why not? I'd say 30 processes is a lot better than 1 process.
1 process is better than 300 processes, and I sometimes have more than 300 tabs open. (I always have more than 100 tabs open.)
If I open two new tabs simultaneously, the whole browser can freeze for a bit.
People who prefer one process per tab tend to mention that tabs freeze up their browser, and I believe them, but this never happens to me. Maybe it's because I use NoScript and have all plugins disabled, except for Flash, which I block with Flashblock.