Well, as Sean said Unistrut is £8 for a 2m length and there's just over 5m of metal there so still quite expensive even if you include the carrying tube and clamps and all the little bits of sticky things...but not denying anyone making a profit or recovering setup costs. Just not for me. You go for it fella, if it makes your tiling look better or makes it easier to install then money well spent. I tend to buy new inventions or new products after a few years when the price has come down. I expect to buy a PS4 in 2016.
don't think it will make me a better tiller as perfection is hard to beat lol i just like wasting money of **** i think