I’ve know lots of people who got into services thinking that they can use the income from clients to bankroll their own product ideas. That is not an impossible scenario — it’s been done before more than a few times, and it’s a beautiful thing when it happens. But it’s very, very difficult to pull off. To do services, you need to wake up in the morning with a different approach to life from the way you wake up in the morning to do products, and only a few people have the skill — and stamina — to juggle both at once.