What others have said, plus: I don't trust you to stay in business at $3/mo. You may deliver an awesome product, but I simply don't believe the economics will work at all for $3/month. At best, you'll cut corners and your service will start to suck. This makes me much less likely to put you in the critical path of my business. So charge more and make everybody happy!

Suggestion: segment on the complexity of the product tour? Maybe by the # of steps included? Or (better) allow me to add audio/video to my tours and charge me more for that.