I have done a bit of thinking and research on the matter and have come up with a few ideas.
BIDJUNK UPGRADE ITEMS & PROPOSED COST IN CENTS
- HIGHLIGHTED ITEM ~ .10
- BOLD ITEM ~ .05
- HOME PAGE FEATURED ITEM ~ .50
- CATEGORY FEATURED ITEM ~ .25
- CUSTOM START / END TIME ~ .05
- ADDITIONAL CATEGORY LISTING ~ .05
In a previous post these were posted as the upgrades available here... I was glad to not see a price for having a store among the upgrades.
If you use the above prices for the credit system you are proposing I would suggest adding a bundle offer of all upgrades for 75 cents worth of credits.
Now, as for acquiring credits... One idea is to reward sellers who sell... basically items sold using upgrades are elligible for discounts on future upgrades. For example: If you sell an item using 50 cents worth of upgrades that should at very least gain the seller a credit discount toward their next auction upgrade.
The posts are a bit tricky to reward... I know there will be some who just come in and post something like a one word post and think they will gain credit for it like those of us who post at least something pertaining to the subjet it is posted in. I think that if we have more moderators (new moderators should start out with less access until they pass through a "probationary period" so we know they are legit.) I am not sure how much credit each post would be worth or could be worth... I think that would depend on the quallity and the content of the posts made by each member.