Bart, I rarely do SXM anymore, but there are numbers stored in my mobile for situations such as this. Included in those numbers are concierge services such as Premium IV, which can take care of everything for me, from VIP meet me at the aircraft door to a last minute charter, to a ride to a ferry and a last minute reservation. I've also got Terrance Rey's number for a last minute Air SXM charter, 'cause it's always good to have more than one option. For hotels, if it gets to that then I may need to do some damage control, and the stored number is for La Samanna.
Cost? Figure a few hundred $ for VIP handling, €1000 for a charter, and the same for La Samanna. At that point, what does it matter? I really really hate having dinner on SXM while someone else is having dinner at the table that I reserved on SBH.