Jay Glazer -- If Alvarez Beats McGregor ... The Money Will Come! (VIDEO)

Eddie Alvarez shouldn't worry about his cash flow in his UFC 205 matchup with Conor McGregor -- 'cause if he beats the Irishman, HE'LL BE RICH ... so says Jay Glazer.  Conor ripped into Alvarez at the UFC 205 media event yesterday -- clowning…