i kind of liked the last option - i would say motivated crowdsourcing!!!

the other option (which has become preferred option recently) is to sell 25%-50% to the new owner who will run and/or control the operations (and see how it goes) and u be there to provide training and support - this will gain the confidence of the buyer community that your business is real business and you're transparent about revenue and growth potential... once the new owner sees that there is real revenue and growth, he/she start taking more ownership on monthly basis or give you lumpsum amount that was agreed upon.