SSkim, don't forget the Audit fees and any other costs that may come along, oh and plus your time.
This question keeps coming up and really it comes down to what the investment plan is. To go through the time and risks for $50k means you don't have a lot else to do, which means you will probably get itchy and start trading, which might be fabulous or turn to shite.
Also may need to cover insurance premiums as someone with $50k is probably not too old and good chance they need plenty of cover that is now purchased as a stand-alone policy rather than possibly at 'group rates' before (but they would probably also have a better type of cover / policy, but plenty of variables in that statement.
For some $50k is enough, for some others a $1mill isn't enough to justify the effort, but like I said, it's about the investment plan.