But, offering up the trip for free will make ALL of these "problems" go away? How is giving the trip away going to give the person any input or control? Or is it okay as long as it's free? Will that make it easier for the person to get off work or should she take anyone along, as long as they can get leave? Should she have ANY choices?
Of course the problems won’t go away. But surely it isn’t difficult to understand that someone might be more prepared to consider a compromise at a lower price? “It’s somewhere you haven’t chosen to go, with people you haven’t chosen to go with and at a time of our convenience, not yours - and it’s only £800!!” is not the great deal the OP thinks it is. At £400, someone might be prepared to deal with those issues.
Obviously if someone can’t get leave, they can’t get it and that’s that, regardless of the price. But that wasn’t my point. Anyone with basic comprehension skills could work out that I wasn’t suggesting annual leave appears out of thin air if a holiday gets cheaper. The point is, OP wants to sell this holiday rather than give it away, and she’s severely restricting her pool with that price.
It’s like a Venn diagram. The number of people who fit into the crossover of all criteria - people who want to go, who the OP would want to go with, who can get the time off and who can afford £800 - is going to be tiny. The one element the OP can influence is the price.