After July 24th auction for the domain name Bitcoins.com, other Bitcoin domain values will skyrocket.
Bitcoins.com will sell for $750,000+ and will be published everywhere making other Bitcoin domain values skyrocket.
BitcoinWallet.com domain was sold for $250,000 (Source:
http://www.coindesk.com/inc-5000-entrepreneur-buys-bitcoinwallet-com-domain-for-250k/). It did not boost the price of any related domain. So, your assumption is wrong.
Moreover, as I can see, already a site is live on this domain. Why on earth the owner will sell it ?