Im not doing tech research.but your right if i was ,id drop it when money got short.Just tech level, which is a palty 40 mil or so .
Ive bought almost every tech on the market, and turned and sold them for circa 10+ times what ive paid for them.And i still have a bunch i havent sold yet.

I paid circa 20Bil for the techs in the above trade, and made circa 15bil in profit on one sale
I sold those same techs to an additional circa 40+ nations,and got anywhere from 5bil to 20 billion per nation for them.
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Ive lost an additional 11 f-15ks to 2 anti air units,2 f-112s and 1 battleship --- didnt even know they were attacking :(
There were out of visual range, and the only sign was the explosions among my air units
Hheheheh sent out a massive 170 f-15k raid that swept across the area removing enemy
anti-air and enemy ships.That front should be quiet for a while now LOL
Cuba is now the number 1 oil producer-11million a day, and 113 more oil/gas fabs being built.U.S. is now number 2 with 8million,and has to import another 8 million a day.
My units lost are now at circa 25.

NOT happy about this.
I can see one mistake ive made already.I didnt make enough strat bombers or long range facility missiles.I have just changed my builds to correct this.
I havent been able to go on a base slaughtering spree like i normally do, and this is resulting in much higher losses than i normally experience.