Reply to All messages:
1) Tax returns
It is very advisable to file them even with 0 income. It will cost you only a postage. Not filing tax returns can be easily considered as abandonment of permanent residency
2) 6 months leave of absense
Have all your US mail coming to some of your friends address. Consider it as your permanent address. When you come within 6 months time frame, it is burden of INS officer to prove that you abandoned your residency. I.e. don't have any documents in your luggage sugesting that you got a permanent job in India ( or any other country you entitled to reside ) or some property bought abroad. But keep everything ( inlcluding your tax return ) that points out as your ties to USA in your luggage.
My opinion: while re-entry pertmit is valid and you are entering USA on the regular 6 months basis - you should not have any problems ( without any documents in your luggage suggesting your permanent affairs in other country )
3) 18 months without the job
No, you can be unemplyed your whole life and live on yuor savings. As long as you are not drawing public funds - you are allright, they can not do anything against you.
but not, while on re-entry, INS officer may suspect that without the job you may be a potential public funds abuser. Having some of your investments would be very helpful to overcome this problem. I.e. coming to US with green card and no job and no proof of money - may be a risky move.
4) guy or not guy
doubt it.
