I understand what you're saying - but I don't really see any difference now. The guys with the big budgets still win (the only reason it hasn't been entirely one-sided so far is because 3 of the 4 races have been wet).
As for Button last year, remember at that time Braun WAS one of 'nobody' teams - they didn't have a single sponsor if I recall.
I really hope the variation continues as the season progresses. Force India are doing a great job, for sure. I'd also love to see Lotus get a podium, but that's probably just a dream this year.