Hi
I would advise you to look at it differently.
It entirely depends on what you want. Challenges and a sense of achievement or a steady cushy routine which probably hasn't changed much.
Money may be a great factor but are you up to the adventure? You probably need to examine it by asking yourself - am I going to love what I will end up doing? Not that you will even figure that out until you have started...
Come to an agreement and take a long leave from the work...look at the offered package as a vacation project that you want ot experiment with...if you are confident about yourself, you may want a probation clause put in so that your interests are covered and so will the Company's interest.
All the best!
Cheers
Sandy