Tyson has a complicated relationship with money.
Though he is incredibly loose with his money, he will never underestimate the value that money has. Tyson only spends what he needs to, with the allowance of ‘need’ being rather malleable when it comes to things that would benefit others. He tips well and rarely looks at the cost of something when buying it.
It was summed up well in this thread with moriartyproperty:
Tyson, on the other hand, only spent what he needed to. Coming from a prominent Jewish family, Tyson had been taught the dangers of drawing attention to his wealth since childhood. Other than what he required for work - to avoid leaving paper-trails from his own accounts - Tyson didn’t use Moriarty’s money. Technically, he wasn’t even paid. Tyson had an allowance of money he could use when needed, but generally it went untouched. Even his work expenses were minimal. He lived well within his means; rarely spending more than he made running his pet store, making maps, and guest-lecturing at universities.
Tyson own personal savings are extensive and if needs be, Tyson has access to the family fortune, but - unless he’s giving a gift to someone, or donating money: to charity or to someone in need - it’s rare for him to use it. In addition to that, Tyson has money stashed in various places for emergencies in storage boxes around London.
The value and dangers of money was drilled into him from a young age and Tyson spent time without money, busking and making every penny count during his escape with The Colonel/back home to Britain, but ultimately Tyson knows that anything he spends won’t make a dent in his bank account.
He doesn’t bother haggling unless it’s a deal for the web and he operates the pet store at the base rate you’d expect in London, simply to make it look like the legitimate business it needs to be as a cover for his activities in the web. His biggest expense is probably the meat he buys for his dogs, the takeout he orders for himself, or buying a new tailored suit once one gets damaged on the job.
Additional pre-existing money based headcanons:
- What is in Tyson’s wallet?
- Tyson & Jethro have a shared savings account from childhood.
- The Piano Man
- When calling a coin flip, Tyson will pick heads nine times out of ten.
- The women in Khushab.
- Tyson has a coin collection, taken from his father
- Tyson can do that trick where you roll the coin between your fingers.
- His money guilt around giving gifts.
- Tyson has a tendency to forget his wallet, despite his anxiety and OCD, because he spends so much time worrying about forgetting things that he starts running late and, thus, abandons items on his coffee table when he took them out of his bag/pockets to make sure that he had them.