Changing a faucet is plumbing but I'm quite sure a non-licenced handyman could legally do it.

But FYI I've been licences for about 7 years now and have done countless closings as buyer/seller principle 

If they were a true cash buyer that did not have any financing costs and did not list it with an agent on resale (Either have a licence to list themselves, paid for a flat fee listing on MLS or didn't seller via MLS and hoped to even save the buyer commission too) then there is some meat there.However if they are buying with 3pt/12% hard money and need to pay a 5-6% commission on the sale you are down to like $25K before paying any other transaction costs on the buy or sell, any taxes, any utilities or any other holding costs that might be there.  

Creating a fictitious offer from a party that doesn't exist in order to try and get the original party to go higher on their offer is just plain wrong.

From my understanding, in Texas, if you have an LLC and you can specify only one DBA/fictitious name.

I drive regularly but I'm Licenced, insured, vehicle is inspected and well maintained.

Would you choose a more fun or unique, maybe a fictitious persons name if that is even allowed or legal?

I just say I have a contract to assign.I find my buyers just on CL just asking who wants t be on my list.I am very careful with this.And yes, the next step is getting my RE licence.

what are the pros and con in having a real estate licence when buying and flipping and buying and renting?

I have HAD my Real Estate Licence, but let it drop.