Whether a cheap purple clay pot bought online is worth buying is a question that needs to be considered comprehensively. First of all, the ** and quality of the purple clay pot are the key. If these pots are made by a well-known pot maker or brand, then their quality is usually guaranteed and they may be collectible. However, if these pots come from unknown small workshops or inferior imitations, then their quality may be greatly compromised and may even have adverse effects on human health. 
Secondly, the balance between ** and quality is also a factor to consider. Although there are many cheap purple clay pots online, the ** of these pots may not match their quality. If you want to buy a real purple clay pot, then you may need to pay a higher ** to make sure you are getting a real purple clay pot. However, too high** can also be fraudulent, so you need to choose carefully. 
Finally, we need to consider our own needs and budget. If you just want to use a regular teapot, then buying a regular teapot may be more appropriate. However, if you have higher requirements for the quality and craftsmanship of the purple clay pot, then you may need to pay a higher ** to meet your needs. 
In conclusion, whether a cheap purple clay pot online can be purchased or not depends on a variety of factors. Before purchasing, you need to carefully consider your needs and budget, and make sure that the purple clay pot you buy is a genuine, high-quality product. At the same time, be vigilant about the purple clay pot that is too low, so as not to buy inferior products.