The least amount of benefits. This is a FREE account, it costs nothing and from now on everyone that joins starts out as a standard member.
These members are the ones that registered before the official launch of Neobux. Now none can ever be a pioneer member. (not even me :D)
This is an upgrade from the standard membership. It costs 90$ and it offers a huge variety of benefits (0.01$/ referral click, more ads for you to view, less recycle cost, higher referral limit, advanced statistics)
After you have upgraded to golden membership (you will never be forced to do this but you will realize yourself it's for the best) there are several golden packs you can buy for increased benefits:
