If you don't trust people not to ruin your blocks then don't sell to strangers on the TO and stick to friends and guild mates.
If you can't find people to take spots at certain times of day then stick to single player adventures at those times.
As well as single player Arabian adventures, you can get decent loot from Outlaws and Bandit Nest, one of which is available in the Merchant for map fragments.
Increasing the loot share when players are missing will be the death of any real of multi-player aspect of game play. Many people will just stick to finishing adventures solo to get the extra loot without needing to rely on others for swaps and we all know how terrible the loot is for co-operative adventures.
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