Cuckold by vibrator - a good sign?

It's been about 6 months now since I've had sex with my wife. She much prefers fucking her vibrator. I love the way we can share the fantasy of her fucking other guys and all I can do is watch and jerk off while she brings herself to orgasm. Sometimes I’m allowed to touch her but other times she won’t allow it. It's so exciting watching her and just jerking off. Often she gets her second dildo and sucks on it! She could easily suck me but she prefers not to.
Does anyone else have these experiences?
Is it a good sign or bad sign?

In one way it's great the way she denies me sex and teases me. In another way, I'm worried that she will forget the true enjoyment of real sex; of fucking a real man. The fantasies are great, but is not having sex with me a move in the right direction of her eventually cuckolding me?

Who else is being cuckold by their wife's vibrator?
Is there any cuckolds out there who began their cuckold lives this way?
Am I already a cuckold in a mild sense?

Thanks for any advice!
Mike

That's small one..

My wife loves her vibrator, makes her cum like nothing else, but I found it to get a little dull watching a psuedo-penis shaped pink object pleasuring my wife. We have since purchased an 8 inch vibrating dildo that looks very realistic, supposedly molded from an actual cock. Watching her get fucked by that big life like cock has brought serious pleasure for us both, and hopefully closer to the real thing.

Thanks guys. I think I'll look into getting a bigger one