Replaced my Ortofon Blue stylus today via plug and play swap in seconds

It does appear at first glance the more expensive cartridges do not have a replaceable stylus.

Some styli cost more than complete cartridge if exotic materials used, such as Beryllium, Boron, Sapphire, Ruby .... cantilevers with advanced profiles. Replacement stylus can cost $500-1000, especially for rare cartridges.

Even brand new Jico replacement styli cost $300-500 easily when it comes to SAS profile and Sapphire, Ruby, Boron cantilevers.

Replacement styli for MM and MI with conventional aluminum cantilever are much cheaper.

If SoundSmith factory stylus replacement is inexpensive (normally 20%)t hen some other manufacturers do not hesitate to change you over 60% of the retail price again when you need only new stylus. The problem is that some cartridge without user replaceable option cost $12000 and when you must pay 60% again they got you! This is the same business model they use for MC, it’s a nonsense in my opinion.

Basically great high-end MM/MI stylus is just about $300 and you can buy as many as you wish for entire life.

Only one addition to Chakster's completely correct remarks: for example, Ortofon asks $236.00 for a new 2M Blue cart, and $204.00 for a replacement stylus.  That's over 80% of the cost for a complete cart, similar to the "re-tipping" fee for an MC.  So I wouldn't say the advantage of replaceable styli is economic, but rather the ease with which an unskilled consumer can effect the replacement...no need to re-align, fuss with nuts and bolts, potentially break delicate wire clips, etc.

Over 80% of the cart cost, but why buy another cart in general (assuming you dig it)? I wouldn't care if it was 100% the cost of another cart, I'd still get the replacement stylus assembly.

To your point: the ease of swapping in seconds. One day maybe I'll get the 2M Bronze or whatnot for kicks, requiring the headshell jazz, but I'm digging the Blue plenty. 

Took a picture of the rarest NOS replacement styli from my vaults for cartridges like Grace LEVEL II, F14, AT-ML180

MicroRidge and MicroLine diamonds...
Boron Pipe, Ruby, Beryllium and even Ceramic Pipe cantilevers...

This is why I like MM type of cartridges.
Styli backup for entire life.

All these great stuff available for true music lovers since the 70's when MM was a king! 

and.... the rubber suspensions are falling apart as we sit here and look at the image.... :P