You're probably right, I know a pilot who's comming back from the A320 course in Miami for interjet but before leaving he was offered, the course, plus 15k usd, a tottal of 60 usd for moving to an other airline and work for the same salary and conditions as with interjet. I don't doubt there a race for the good pilots, specially when volaris is planing on getting 57 airplanes and interjet around 50 too.
Now aerolitoral is also adding new EMB to their fleet and are hiring more pilots.