With sponsorship you need to look at what you're offering in return. A few track days don't really offer anything to a sponsor. The only people that see that cars are the people there, you don't really get a lot of speccies.
Hill climbs and rallies tend to get a few more (presuming they are spectator friendly events) so they are more attractive to sponsors. Offering a sponsor a passenger ride at a track day doesn't sound that appealing if they could just do the track day themselves for the same sort of money.
Rather than looking initially at what to charge, I'd recommend seriously looking at what coverage you can give the sponsor and then basing the costings on this, which also gives you good selling points to the potential sponsors. This is what they are paying for after all, the opportunity to gain more business by advertising with you. Going along and saying "sponsor me and you get a sticker on the car" is very unappealing. You need to really sell to them what they will get in return in the form of potential business.
This is my experience anyway, HTH.
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