Those numbers are not gonna fly IMO. No one would give you 10% of their company (worth approx. $2.5M in cash) for consulting. If they are, it means they have burned $25M in cash, and are desperate for someone to bail them out of some terrible problem, and you are agreeing to work for nothing.
That's how much a co-founder or very early essential employee would have of a reasonable company.
Even 2% seems too high. but is suppose it depends by what you mean by consulting. Are you acting as CMO for the company? Maybe in that case.
Usually it's something like this: your rate is $200/hr, but you know the company is strapped for cash and you don't really need the money. You agree to annual services in a contract, estimate the number of hours, and accept shares of the company at a strike price equal to $200-$400/hr. Even at $200/hr in shares it could work out very well for you because you are assessing those shares at a value before the company is profitable and is mostly a reflection of the VC money. This could translate to 1000 shares/hr. Fast forward a few years, and the company goes public at $20/share. Additional VC rounds dilute your value, let's say by 50%. You worked 10 hours. If you took the cash, you made $2k- congrats. You blew it on a weekend to Vegas. If you took the equity, you made $100k, and didn't pay taxes until you sold.