The large budget thing is a little off-target. Sure there are some fonts linked to around here going for £200+ that are obviously restricted to the larger projects, but even if a project is something you're doing free of charge, it's still justifiable to purchase a particular font if it's what you're after - not only do you then have the font to use as you please, but there's no point going for some substandard alternative if it's a project that'll end up on your portfolio..