Mastiff x Rottweiler: why?

Over the last few months I`ve noticed a lot (and I mean a lot) of Mastiff x Rotties advertised. To the extent where they are overtaking the Doodles.
I don`t want to upset the owners of such dogs on here - I am puzzled as to why this cross is being bred. I don`t really see what one brings to the other?
They are similar in size, shape, temperament etc - so what`s the point?
Can anyone tell me?

As I said in another thread about these sort of crosses it's to make money. That's the only reason these sort of crosses are bred on purpose.

Well, yes obviously - but why are they so popular?

Probably Joe Bloggs has a Rottie bitch, his friend has a Mastiff dog, their genius brains put two and two together and decide that a litter will be a nice money earner and voila, more crossbreeds out there for sale.

Cheaper than either pure dog maybe ??
When they say mastiff i wonder which they mean?? not old English going by the size of the dogs ...

No it seems to be French Mastiff - which aren`t that common.
So why are people buying them?
I suspect it is to get a bigger Rottie? Is this right do you think?

Yep and if they are using dogues they will be doing it for colour ..
light eyes and red nose ...

No it`s Neapolitan or French Mastiffs, and they go for £500 +.

This would be my guess to be honest.

French Mastiffs and the Dogue de Bordeaux are the same dog..