sending attacks with pure stealth might be fun, though!
for me, massing traps isn't such a good idea. last round, i killed so many traps (it's rare to see spikes, though) and gained quite a bit of h/f for doing so. my targets sent out and 2 ticks of free kill. i didn't have to worry about not having any troops to kill (whether targets being online or offline) and traps were my favourite targets for easy h/f. :X i feel spike traps are too expensive to invest. if you are a very active solo and can always LT your incs, then buying up at the last second would be nasty and fun. but having traps at normal times feels like a waste to me. (SGTs are cheap, so, don't feel as much of a waste as spikes.)
i think i'd prefer going for stealth thieves and take care of incs with buying more SGTs and *basics (hippy/yob)* for LT.