Yeah that is a problem but does a antistatic band do away with the worry about static electricity discharge?
As long as it is connected to another object that is grounded, it will dissipate any static electricity that has built up on you.
When building, have the PSU in the case and plugged into the wall (with the switch off), then clip the band to any exposed metal on the case. The band will carry any charge from you to the case, then through the PSU, then into the wall socket's grounding pin and then to Earth.
As well as this there are some other precautions. Build the machine on a non-conductive surface (wooden table, a stone bench even cardboard are all good surfaces), don't stand on carpet when building and be barefoot or have shoes on. Also don't touch the gold pins/plates on the RAM or bottom of the CPU.
If you follow those, you have nothing to worry about static wise.