No. They will not do that. No good VC would not force you to take a high salary if you would rather the money went into the business. They'd probably even like that. A founder should be setting the vision and culture of the company. Compensation is one piece of that culture. You set a precedent by taking a big salary and you set a message by taking a small one (i.e. Jet Blue - CEO, COO, CFO each have a base salary of $200,000 / turned down bonuses during bad years).