Your not wanting to make use of the tools available to you to narrow your searches is not justification for the devs to change the current system.
Try searching by the name of the enhancement you want to buy/sell.
Try searching by the level you want to buy/sell.
Try searching by category. SO's, DO's, Crafted, etc.
QR:
to add to what forbin said: STOP BEING A LAZY [censored]!!!!!!
If it's a simple matter of screening out the 51-53 results, set the default to display 1-50 results. The transaction history demonstrates that nothing outside this range generates any real interest. There are real enhancements past 51, but SO's primarily, mostly changing hands below 5000. The scary transactions are ones like 185 million for a lvl 53 range, training origin. Someone obviously transferred money. I wonder if it went where they intended. For their purposes, NOT displaying transactions past lvl 50 would be helpful as well.