Again... a quick look at other lightning threads would have told you quite a bit... but since you don't seem able to do that...
A boat with a proper lightning bonding and grounding system will have more of a chance of getting hit, but will generally suffer less damage than a boat that is ungrounded/unbonded in the case of a lightning strike. Conversely, an unbonded/ungrounded boat will generally get hit less often but has a greater chance of having catastrophic damage done if it should get hit.
The tradeoff is whether you rather be hit and protected better or risk getting hit harder but more rarely. In either case, lightning strikes are fairly rare.
Also, a good site to check out is Dr. Thomson's site
. This site is probably referred to at least once in any thread discussing marine lightning protection systems.
From what I've seen, most boats do not have a lightning bonding/grounding system in place.
A badly designed lightning protection system can increase your risk of sinking. You should never ground thru-hull fittings to a lightning protection system, and if Valiant is doing so, they're being pretty stupid about it. Lightning will never strike at a thru-hull, which is below the water's surface, and there isn't really enough metal there to make bonding it worthwhile. Thruhulls should be bonded in a galvanic corrosion protection system, but not in a lightning protection system. The only parts that should be bonded are the major, above waterline components, and they should be connected to a grounding strip embedded in the exterior part of the hull. The stays, shrouds, and mast, and possibly the pulpit, pushpit and lifelines should be connected with heavy #4 AWG wire. The mast should be connected to the grounding strip with a heavy #4 AWG wire, running as close to vertical with as few bends in it as possible.
The thru-hulls, engine and electrical system should be isolated from the lightning bonding system... as should any galvanic prevention system.