If buying in for $300 would make me think of the chips as money, because I have a shallow bankroll, then I would be losing value by increasing my buy-in to $300.
After taking a 4 yr hiatus from NL poker, I was approaching the point in which I was ready to retire from work all together & starting playing again with a $2k bankroll. I bought in for $220 keeping my stack between $200-$220. As my bankroll increased, I slowly increased my bankroll. Once it was $6k & the hours at the table convinced me I was sufficiently rolled for 1/2NL, I played with $300 & since the chips were only tools, I was fine........well, almost.... There would be the times I'd run it up to $600+ & 2/5NL sharks came to the table & I would p/u & leave.
That was in the spring of 2014 & I can say with complete confidence, that it is because of 2+2 publishing & this forum, that I'm still alive & kickin'.