I believe Sam Walton, founder of Wal-Mart, had a good insight on pricing. He knew he could sell a specific quantity of a product at a high price/margin, but he bet he could make more money if he lowered his margins and sold more product. I believe you'll have better premium subscription revenues if you significantly drop the price.
Sebi, I really appreciate what you've made thus far. Remember, however, that you chose to do most of this on your own. Many have volunteered their time and talents to help you over the years, but you've opted (to the best of my knowledge) to keep all the development work to yourself. I can't fault you for wanting maintain control, but--imo--delegating tasks to others could have allowed you to maintain control without having to do it all yourself.
That said, look at how many are signing up and paying. If not enough, poll the community to see how many would sign up at different price points.
Would you rather have 100 users who each agree to pay $7.00 per month, or 1,000 users who pay $2.00 per month?
If the feature set is right, I'd pay $30.00/year for premium features here. If you really knock my socks off with features (and if the marketplace prices eventually better match prices across other sites and marketplaces so that my local trading partners trust them), I might even pay $40.00-50.00/year. Today, however, I don't see features that would entice me to pay even $2.00/month, much less $7.00/month.
BTW--thank you for grandfathering the "Private" inventory feature for existing accounts that had been using it.
I'm looking forward to more good things in the future. Good luck on this next leg of your voyage.
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TradelistBlack and Blue--not just for bruises anymore.