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This would only make sense if you really have a use of this opportunity information, such as detecting the date at which the opportunity was created and setting the contact in a specific campaign or stream, of just stop all marketing activities for a while. Creating all orders as "won" opportunities may also make sense in term of pipeline reporting, so that you can have a complete picture of all the business. But his has nothing to do with Marketo
There is at least one conditions that you will need to fulfill if you want it to work : not only the sales need to create an Opportunity, but they also need to attach relevant contact as "contact roles" of this opportunity. If you do not to this, Marketo will not see opportunities in contacts.
Attaching the contacts to opps is where generally things go wrong : The whole thing is a process that sales hate in general, because they have the feeling that this is cumbersome process to which they attach no value. In other words, a waste of their precious time.
If this is really needed, I would encourage you to look into the possibility to have these orders created automatically in the system.