BTW there are many ways to multitable without extravagant monitor setups. By stacking and using table management software you can play theoretically unlimited tables on a low resolution laptop display and nothing else.
Even without full stacking, you can still increase your table capacity on limited desktop space by combining stacking, tiling, and/or overlapping tiles. Again, using table management software is a tremendous help with doing this.
I personally don't like stacking, preferring instead to tile. I like to be able to see at a glance what's going on at every table at once, and when multiple tables require my action at the same time it's a lot easier when tiling. I can tile 9 per monitor but prefer 6 per for comfort. At my peak, multitabling cash on FT before a -30BI swing made me take a hiatus, I was playing 12-16 tables this way using 2 of 3 monitors. BTW my triple monitor setup was not done for poker, but for my job and other computer-related hobbies. But it certainly does come in handy for poker. These days I seldom play more than 8-9 tables, and usually 6 or 7. Largely because I couldn't play more if I wanted to given US player liquidity (unless I played across multiple networks) and the types of games I play now.