sbiddle:Remember WiFi is a two way medium. It doesn't matter how high you crank up the power, your laptop/phone/tablet which typically has a very low gain antenna still needs to transmit back to the AP.
On the odd occasion I get asked if boosting the signal on the AP will make a big difference.
Arguably, if the problem domain is to improve some type of streaming app via UDP, then perhaps the boost would be worth it. Otherwise, if it's TCP, then the (s)lowest common denominator can have a significant impact on perceived/expected throughput.