In addition to changing the economics and speed of early business growth, bootstrapping can have a very serious negative side effect: attachment.
I'm all for being passionate about a business and giving it 100%. In fact, it really should be an obsession. But attachment; safety blanket, clinging, totally irrational attachment, can really kill a business. It happens when you grow your baby from a fragile idea to a real business with robust revenues. Risks become subtly and imperceptibly more difficult to accept.
Attachment causes stagnation. Its hard to give proper credence to good ideas once you've put too much stock in the way things have always been done. The problem is further compounded by the tendency towards less oversight in a bootstrapped business. Somebody needs to be able to call bullshit on the founders.
Attachment blinds founders to exit opportunities. Mergers, investment, and acquisitions all involve a decrease in control. Its not so hard to convince yourself to go from 40% ownership to 20% ownership for the right deal. But it can be incredibly difficult to go from 100% to 80%. There are only 2 options: One, get used to running a lifestyle business for the rest of your life. Or two, get used to the idea of giving up a chunk of your business.