Sure there are train wrecks but they are rare, very rare, the vast majority of spiders are doing just fine living their life just like any other BP.
In most cases the wobble is hardly noticeable especially if you do not know what to look for and it can lessen or worsen depending on several factors (temps, stress, feeding). A bad wobbler can produce offsprings that hardly wobble and vice versa.
Like with producing anything there are risk spiders however is not the only mutation known to wobble however it is the one people talk about the most (see champagne, woma)
As for the money in spider that's not where the money is if you really want to make money.
Bottom line breeding has it's risk there is no guarentee when pairing 2 animals regardless of the mutation that the offsprings will be healthy.
When it comes to known issues we all draw a line somewhere mine is regarding known physical deformities I don't work with caramel or super black pastel and super black pastel combos for that reason even though I would love to have a panda.
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