Change to $10 (Patreon)

I've been considering a change to the $10 tier. Most people opt for the $5 or the $20, and I think the $10 needs some beefing up besides advanced copies of stories. I'm thinking I'll create a raffle for a $10 patron to win a 500 word flash commission (which is what the $20 patrons get guaranteed). 

Here's the questions: $20 patrons, would this feel unfair to you? $5 patrons, would this ben an incentive to bump up your support to $10? 

Let me know in the comments