This is an easy question to answer: Not.
Why? Simple math. Right now, a Verizon plan costs $80/mo for 10GB for a 4G Mifi. Current speed tests show you can get 13Mb/s. 10GB worth of bandwidth at about 1.3MB/s goes in about 2 hours.
You pay $80/month for 2 hours of full speed 4G service.
10GB is about 5 HD movies give or take.
So not so much.