The Ferengi did become comic relief a bit too much, even in DS9, although they did try to balance out that with cunning and wit somewhat. But the reality is there would need to be a significant amount of rough and effective Ferengi for them to be a middle power of the Alpha Quadrant as they are generally portrayed. I think it might have been based on a desire to not just make the Ferengi discount Klingon pirates of the week but in reality dealing with the Ferengi would be a formidable affair and their complete lack of scruples would be a huge factor in their success.After a fashion, but where The Last Outpost featured physically comedic Ferengi, the Ferengi of Rascals were manifestly stupid to the point of hilarity after their brief initial display of competence at commandeering the Enterprise.