Should I Geld Him?

          Sergio (Itsgoodtobeapepto) is a son of Peptoboonsmal out of a big, beautiful daughter of Doc O Lena.  I have owned him for four years, having purchased him from Todd Crawford's place when he was four.
          I am a Nonpro Reiner.  I have been riding and showing reining horses for over 10 years.  After owning a couple of confidence-breaking geldings, riding Sergio was a breath of fresh air.  I enjoyed riding a horse who was interested in my thoughts and opinions only after he checked out the mares in the area.  His confidence has given me confidence.

          He has always been a gentleman, and never so stud-ish that I was afraid.  My twelve-year old daughter has ridden him, and she leads him around safely.  Again, he is always well-behaved, keeping his head down near her and walking quietly to wherever she leads.  Unfortunately, as a stud, my daughter cannot show him.
          He has performed well in the show pen, for both of my trainers and for me.  He has grace and beauty.  He has been shown in cowhorse a handful of times, where he has been a great competitor.  He has won a couple of buckles, and he clearly enjoys it.  He has also done well as a reining competitor.  One of my trainers won the Intermediate Open year end award in our affiliate on him this past year.  The prior year, I won third in the Novice Horse Nonpro division.
          My trainer has advised me to geld him.  He thinks that my daughter would be more competitive if she showed this horse, and he says that if I am not going to breed or promote him, I do not need to own a stallion.  He also thinks that Sergio would be worth more if he were a gelding.
          Sergio's semen have low motility, making shipping it near impossible.  I have attempted to promote him in the past, but I have a full-time job and my trainer has other more successful studs in his barn.  So Sergio's exposure is limited.
          I am in conflict.
          I am afraid to cut him.  The way he is now is wonderful.  He's engaging and fun, he is in beautiful physical shape, and we are competitive in the show pen.  It seems a waste of great bloodlines to take away the opportunity to breed him.  My vet is confident he could settle a mare if the mare were inseminated on site, with fresh semen.
          I am afraid of what he will become and what I will lose if I geld him.
          Does anyone have experience with this?  What is your advice?