Maybe anth, but i'm thinking this way.. If Iride is not getting enough numbers to run shuttles on both days of the weekend, and sometimes even 1 day, then what happens when they've invested more time and money into adding to the services offered and they don't get the numbers? Just a bigger headache? Your idea is good but I think the reality of it is, to expand in this way would be a major direction change and i don't think that's where they want to go with it..
saying that, this is the first year that i've ever heard of there not being the numbers so maybe that can be put down to the soaking summer we've had keeping it closed down for the peak operating period, not sure However, also due to this period being missed they have been offering Sat and Sun ride days (usually is only Sundays) so maybe this is why the numbers have been down? 3 sundays a month attracts better crowds on those days, but full weekends every weekend is too much I don't know just throwing that out there.. But any other time numbers have been good, so maybe there'd be scope to investigate this IF that's where they wanna go? Just from knowing many of the crew that ride there, including myself, a full weekend would be too much generally with other commitments, it's fine to make a day of it but a 2 day overnighter for most is a completely different story.They'd be relying on what i would think would be a fairly small number of groups interested in this, spread over a fair amount of time(Say nov-April?)and the realistic chances of making this kind of operation viable would seem pretty small..