Are prototypes a necessity?

[Inventoy]

I have heard stories in the past of inventors who have sent off a simple sketch on a napkin and their idea has become reality. I have also heard of others who spend £100 or less to get the same result. I would be interested to hear if anyone on these forums has managed to licence a toy idea without presenting a 'works like' protototype or even no prototype at all.

Look forward to hearing your views on this.

Cheers,

Inventoy.