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Also, just based on the position on the page of your product offering and some language you used, I think you desperately need someone to give you permission to make money in return for the value you have created. I struggled with this six years ago. So, karmic balance: it is totally OK for you to make money. You can put a prominent buy link near the top and write sales copy that doesn't sound like you think you are cheating people. It's OK! Folks buy stuff all the time! We like buying stuff! Also, many of the folks buying this will be business users. Even the least sophisticated businesses are systems which turn money into money by buying things, most of which will not make money into money nearly as nicely as your software will.
Nice how this is added to the bottom of the home page:
"Do you need customization services? Ok, you can hire me!".
I.e. When code needs to be written...
about the premium version: i would try testing various prices to find the optimal point. Try doing some a/b testing on the price and find the best (this is the only price strategy that i would recommend anyway) and playing with the keywords in your adwords ads.
another thing to think about are multiple premium levels, i would add some "premium" feats like: A/B testing Mailchimp integration Kissmetrics integration Gamification features (badges,goals...) Filesharing integration paypal backed e-commerce shopping cart a special stategic dashboard (that for example tracks your klout score )
and ask more money for that (or ask on a per feat base or make segmented versions for different user needs).
I will add Enterprise level, you just throw in telephonic support or basic customization and charge 500$ (test for it!) for that and you can do this right NOW :)
One more thing: there exists this curious psychological effect by which most people will stick with the middle and more conservative choice, so if you have a basic/premium/full offer, most (paying)customers will buy the middle one. One strategy that won't hurt and is plain simple to adopt is just to add another, top of the line, version to drive attention up to the full offer.
my 2 cents. Diego