Re: Servicing
Most maintenance interval recommendations by the manufacturers are:
Every 100 hours
or Annually, whichever comes first.
I'm lucky to put 25 hrs on my boat every season

, yet am very methodical with all of my maintenance checks. I also perform all of my own maintenance thus cost besides parts isn't the issue for me.
Do I fully agree with the "annual" requirement regardless of hours used? No, but that only applies to some of the items I look at. It would really be inappropriate for any tech to give you a maintenance recommendation without fully understanding your typical boating environment and annual use etc.. Not to mention the degree of attention you give to your own pre and post boating checks etc..
As mkast stated: "Preventative Maintenance" is key to a boat. Some items if left unchecked not only could leave you stranded yet cost tenfold to repair vs just replacing each season.
If an option, I would suggest getting a repair manual for your engine/drive and learning to perform the easier items yourself. This will save you some money as well as get you more intimately aware of your boats needs etc..
Happy boating.