Domain Development will add maximum value only if it reaches its logical conclusion. Whether it is a minisite or a full fledged site finally it should attain the objective of revenue generation.
If you are looking to put up a site on a domain(one which has no traffic & revenue) and try to flip it you will find very little takers who would value your development cost. It will take time and effort for the site to start earning. Be prepared for it.
Its like all or nothing scenario. Domain Development is not for everyone especially if you are looking to make a quick buck imho.