Shares of Penn National are up 156.42% this year, closing at a new 52-week high of $65.54 apiece Monday. DraftKings, which also on Monday became a co-exclusive partner with ESPN on gambling link-outs, have risen more than 170% since going public through a merger in April. Additionally, DraftKings will now be ESPN's exclusive provider of daily fantasy sports. Reeg said the fact that legalization of sports betting in additional states is still relatively new may make the gaming industry difficult to evaluate right now.