snipers are nice anti crab yeah.. but..

spider has the best non napalm anti sniper decloaker in the game (flea)

crabs can sit on the back face angle of the top of the spire so they can only be hit from the sides by snipers.. allowing them to force the snipers in closer.. and the crab still gets a quite nice fire angle over the tip of the spire

widdow can sometimes scout snipers too and if you place it on fire at will they will often emp sniper before it can shoot.. but again mass flea is better and is the true answer.

if enemy counters you with lotus or pickets then recluse + flea will work unless the snipers micro to kill the recluse =/

if you cant flea then switch into something that can handle sniper like firewalker.. unless they have shields.. snipers + shields + mass lotus is really op vs everything except a major assault surgical strike (cloaked snitch, tac missile.. ect) or air