Nice promotion and I like to play on Limbo, but 0.5$ minimum bet size is way too high for me.
It is a VIP promotion with nice rewards so the min bet is basically worth the rewards. I do think that the min bet is a bit lowered than the older VIP promotion. AFAIK it was $1 min bet for similar VIP promotion in the past. Few days ago, you also said that you are far from the bronze VIP level so you cant participate since only bronze level and above are allowed to participate.