A Pennsylvania State House committee is hearing testimony on legislation that would increase efforts to stop on-line scalpers from manipulating concert ticket sales. Lawmakers say these kinds of buyers flood on-line sites in getting tickets, then sell them at higher prices to consumers. The Consumer Protection, Technology and Utilities Committee took testimony on House Bill 1378 regarding the use of so-called “grinch bots” to buy large numbers of tickets quickly for popular events. The panel held a related hearing last week on House Bill 1658 to ban the practice of speculative ticketing.