First, it would cost you 20¢ per text to receive. If the marketing companies send you a text message to advertise or promotion their product, why you must pay to receive unwanted text message? Why the wireless service providers did not do similar as with the traditional mail: Charge the sender? If you cannot charge, then don't send it to your customer. When the congress take care this issue?
Second, there is another kind of text message called premium text message. This kind of premium cost you more in addition to standard rate. You may pay from $1.99 to $9.99. The charge maybe one time or recurring.
If you search for keyword "premium text message", there are a lot of entries regarding to fraud, scam, abuse, complaint.
Bottom line, do not reply to unsolicited commercial text message. If they send again, reply with "STOP". Again, why we must spend another 20 cents to tell the spammer stop?
Premium TXT Message Scam - Verizon Wireless Community
Red Tape - Price for 'premium' text messages? $10,000