You might not think it worthwhile, but the backmarkers obviously think it worthwhile. Otherwise they wouldn't be there and wouldn't be able to raise the cash to race.
Remember when the sport was so healthy and so many wanted to compete that they had to have pre qualification, and the 107% rule was enforced? Personally, I think more teams are better for the sport, they allow development of a broader pool of talent (engineers and drivers).
I also think the final two places should be given to two single car teams and split for EU and non-EU races. Then you could have the next Minardi or Jordan learning their trade with one car each on the EU circuits, and maybe Chinese or Indian teams doing the same on the Asian circuits. These teams would most likely be traditional customer teams, ie they would be allowed to buy engines, gearboxes, chassis from established teams.