Hi Carl,
I guess that'd be good for about 2 days a month, but I'd probably end up working on it more than that, especially in the early days. Either way I work fast, so you'd see a lot of bang for buck even for that.
Truth be told, if I am going to make this thing the dogs danglies as you say, I'd like to think there might be a wee bit (just a wee bit) more in the pot per month, especially if it's being developed ongoing. I'd also probably look to reward loyalty - e.g. discounts for paying 3, 6 or 12 months upfront (once you know you like it!)
I know you're comparing with aworka, but - fine as it is (and it's not like I've got anything to compete yet!) - it is a somewhat generic system, catering to "everyone from web designers to gardners", and therefore could never really do the ful business for any one specific market - i.e. window cleaners.
I think the attention to detail and window cleaner specific feedback I'll put into this should be worth a bit more, but...
To be honest I'll probably look to take feedback from you guys during the beta! Perhaps see what you think of it first, then see what it's worth to you...
But hey, going back to your original point, in the bigger picture of things, if this could support me full time, and if there was stuff to do on it that would add value to it and make users happy (and make it more appealing to more people and therefore make it grow), I'd gladly work on it full time - ongoing.