No matter how many profiles the person can have. The limit to witness vote for each profile will make it impossible not to dilute Vesting power among several profiles in order to vote for more witnesses than the limit allows.

Example:

If limit of witnesses is 5 and user with 10 SP wants to vote for 10 witnesses:

• can vote with the whole 10 SP into 5 witnesses;
• can create second profile and delegate 5 SP to it, so each of the 10 witnesses will have only 5 SP of vote instead of the whole 10;
• can create 2 more profiles to vote for 20 witnesses(making a total of 4), each getting only 2,5 SP of vote.