How do we come to the determination that the Spell Card isn't affecting the monster? Let's look at the examples posted so far, (bear in mind, I'm not neccessarily replying to your posts):
 
But even in this instance, we're not quite looking at the same or similar card effects. 
Snatch Steal is looking at nothing else but the opponent's Life Points to see if it has been increased or not. The monster it is eqipped to is not even part of the equation. The only thing 
Snatch Steal is interested in is the opponent's Life Points. 
 
Raregold Armor, on the other hand, is looking directly at the monster it is equipped to and marking it as an attack target. This is why 
Staunch Defender cannot mark it as an attack target, because it is unmarkable. The spell is directly affecting the monster as it has everything to do with the overall effect.
 
 Another effect that is distict from 
Raregold Armor. 
Gravity Axe - Grarl is only going to be looking at the oppnonent's side of the field. It looks directlt at battle positions and stands independent of the monster it is equipped to. 
Raregold Armor on the other hand, is looking directly at the monster it is equipped to.
 
Again, what is balck pendant looking at? It's looking to see if it was sent from the field to the Graveyard. It doesn't even have to be activated to get this effect. This is an effect that is truley independat of anything it's equipped to. 
Ring of Magnetism, however, is a trump card. It overides the effect of anything that effectively says "attack me". It's special in that case.
 
 
 
Look at 
Raregold Armor's text more closely:
 
"As long as you control the monster equipped with this card, your opponent cannot attack other monsters other than the equipped monster."
 
This effect is designating an attack target. It's looking at nothing else but the monster it is equipped to and saying "attack me". There are no effects here that are independant of the monster. Everything hinges on the ability of 
Raregold Armor to make the equipped monster a legal attack target.
 
All of this has to do with legal attack targets. Making an illegal attack target legal has never been possible. There is no affecting of the player. What we're trying to determin is the legalizing of an attack target.