You may as well be throwing tenners out of your window, cade lambs = loss.
Not necessarily.
I'm doing pretty much the same as you want to do, with 18 in at the moment. I rear them on a shepherdess until about 3-4 weeks old, then onto bottles for the last couple of weeks before weaning abruptly at 6 weeks. It costs us roughly £60 to buy, feed, kill and cut each lamb, and sell to friends and family. So if you're planning on just taking them to weaning, I can't see you making much profit if any. Last year we lost a couple fairly late on for different reasons so bought some 3 mth old stores for £50 each.
They aren't easy and do take up a lot of time, they will drop dead with no notice, a lot of people won't want to buy tame lambs as they can be a bit of a nightmare.
Once they've come off the milk they need to go out really, they need to get out and learn to be lambs and not so dependent on you. My oldest group are 5 weeks and are starting to be a bit of a nightmare at feed times. So no, if you're thinking of selling at weaning, don't bother.