Do you know that they are the same thing for a fact or are you just making things up?

http://www.bestsynthetic.com/edu-grease.shtml
http://www.pecuniary.com/faq/grease-compatibility.html

The Park Tool grease tub can be found for $7.99 and some auto bearing grease as low as $5. 1+ lb tubs should last a home mechanic for a couple years. That's not a huge difference to me. I won't buy tubs of grease since it is virtually impossible to prevent it from getting contaminated once you open it. I only use grease from a tube.