so you have 14-16 shots for stand and shoot? that would be -2 to hit (usually) so you are hitting on 6s. you will do an average of 2-3 wounds before saves on anything that charges. with a 4+ save that would be ~1 wound. i have a hard time seeing any one except possibly a giant think twice about that tbh. i always try to assume that my opponent is at least as smart as i am, and if i can easily come to that conclusion, so can my opponent. sure, sometimes ill be happily surprised that my opponent cant see through my schemes, but i think it is a bit risky on relying on tactics that only work against stupid ppl so to speak (no offence intended)
the above mentioned unit would cost around 300 points. for the same cost i can get 25 saurus. the saurus do just slightly fewer kills (than the 3 krox version) but have more ranks and a LOT fewer saurus than skinks will die. it does have the mobility advantage, but that is it. i am not saying it cant work, i am saying it is worse than the alternative of saurus. only when fighting something that relies on stomp a lot (ancient steg is the only thing that comes to mind) will the skinks have a chance (compared to the saurus), since you cant stomp them.