A bass is no different than anything else in the marketplace. As with anything else, improvements get progressively smaller and the cost exponentially higher. There's a line that has to be drawn in term of diminished returns, but that line is highly personal and subjective. Some will find a Kia to be their perfect car, while others will find value in an Audi or BMW. No one in their right mind will tell you that a Kia is as nice as an Audi or BMW. Just as no one will tell you a MIM Fender is as nice as an NYC Sadowsky. Is the cost difference worth it? There is no one size fits all answer. Only you can decide that. And really? People probably care less about your decision than you think.