The Excelsior Acquisition - S3-E16
Trivia: Raj's question about why so many of Stan Lee's characters' first and last names begin with the same initial (Peter Parker, Reed Richards, Bruce Banner, etc.) has been answered by Lee in interviews before: He has a bad memory for names, so if he can remember one of their names, he knows the other starts with the same letter.
The Excelsior Acquisition - S3-E16
Trivia: The judge at the courthouse is named J. Kirby. Jack Kirby was a Marvel comics artist who partnered with Stan Lee, who also appears in this episode, to create The Fantastic Four, The Incredible Hulk, and many other Marvel comics.
Suggested correction: Not being able to afford doesn't necessarily mean he doesn't have the money, especially a man like Sheldon. He works with a budget and he sticks to it. In his budget he has a certain amount set aside for rent, anything more than that and he can't afford it alone.
Nonsense. If he was sticking to a "rigid budget" he wouldn't have even thought of lending a hopeless credit risk like Penny a single cent. Instead he throws a huge bankroll at her without even discussing a repayment plan.
Rubbish, I stick to a strict budget but still have the money to lend to close friends. Like Penny is to him.
He might have different budgets for different things. People could get a higher margin because they could be of more use to the scientific mind of Sheldon.